Earlier this week, I wrote a post about letting your children use an iPad. I mentioned locking it down, filling it with apps and letting them use the tablet in small increments. In a minor oversight, I didn't mention any of the apps that I put on my iPad. To make up for that mistake, I've decided to do a series of posts on educational apps for kids. Below you will find five apps that are both entertaining and educational for four to six-year olds. In the next few weeks, I'll do another post for older kids and one for toddlers, too. If you have a favorite, feel free to share it in the comments. AniMatch ($0.99) Made by Lima Sky of Doodle Jump fame, AniMatch is a fun, matching game for youngsters with cute graphics a